Registration Dossier
Registration Dossier
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EC number: 201-180-5 | CAS number: 79-14-1
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 13 January 2021 - 18 August 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 79.1 °C
- Conclusions:
- The average of two assessments gave a melting point of 79.1°C (onset).
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- capillary method
- Melting / freezing pt.:
- >= 78 - < 80.5 °C
- Conclusions:
- The melting range of glycolic acid >99% was found to be 78.0 to 80.5°C.
- Executive summary:
The melting range of glycolic acid >99% was found to be 78.0 to 80.5°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 13 January 2021 - 18 August 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Conclusions:
- When heating from 20°C to 85°C, an endothermic peak was observed at around 84°C which corresponded to the test item melting point. The cooling from 85°C to -40°C gave an exothermic peak at an onset of 32.98°C, an end point of 30.09°C and peak temperature of 31.00°C for test one and onset of 33.86°C, end point of 30.90°C and peak temperature of 31.75°C. This endothermic peak is assumed to be due to crystallisation of the melted test item with it changing from a liquid to a solid.
The test did not give a definitive freezing point but crystallisation appears to happen at an average temperature of 31.00 + 31.75 /2 = 31.38°C.
Referenceopen allclose all
As part of the assessment of freezing point and boiling point using DSC the melting point was also determined. The DSC gave a sharp endothermic peak with an onset temperature at 79.10°C and end point temperature at 84.75°C, with peak temperature at 84.33°C for first test and 79.12°C and 85.67°C, with peak temperature at 83.57°C for third test (A second test was also run but this did not produce results due to the instrument stopping).
Description of key information
Melting point (transition from solid to liquid state) of glycolic acid was measured to be 79,1°C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 79.1 °C
Additional information
Freezing point (transition from liquid to solid state) of melted glycolic acid was measured to be ca 31,4°C.
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